Tooth.



L. DAVIS.

TOOTH.

APPLICATION FILEDv nu 1, 1911. v

1,016,555. Patented Feb. 6,1912.

lnvento Attorneys` LOYD DAVIS, 0F NAUVOO, ILLINOIS.

TOOTH.

speemcation of Letters Patent.

Application filed May 1, 1911.

Patented Feb. 6, 1912. Serial No. 624,360.

To all whom t may concern Be it known that I, LoYD DAVIS, a citizen of the United States, residing atNauvoo, in the county of Hancock and State of Illinois, have invented a new and useful Tooth, of which the following is a specification.

This invention relates to dentistry.

The object of the invention is in a ready and practical manner, to simplify the procedure of attaching teeth to crown work, the operation being such as to insure accuracy of fitting, great strength and durability in use and readiness of repairs when necessary, the improvements beingspecically for use with upper and lower molars and bicuspids and in connection with fillings, posts, or the like.

With the above and other objects in view, as will appear as the nature of the invention is better understood, the same consists in the novel procedure of attaching a tooth to a crown, as will be hereinafter fully described and claimed.

In the accompanying drawing forming a part of this specification, and in which like characters of reference indicate corresponding parts Figure l is a view in perspective displaying a tooth embodying the present invention. Fig. 2 is a vertical longitudinal sectional view through two crowns and a bridge, showing the tooth secured to the latter. Fig. 3 is a transverse sectional view taken on the line 3 3, Fig. 2. Fig. 4c is anv inverted plan view of a slightly modified form of the invention.

In describing the invention, the term tooth will be employed, but it is to be understood that the procedure may be carried into effect in connection with one or more teeth, and as this will be readily understood, detailed illustration of any modification of this part of the invention is omitted.

Referring to the drawing, 1 and 2 designate two ordinary crowns, 3 a bridge, and t the tooth that is to be connected with the bridge.

In carrying out the procedure, after the abutments, of whatever character they may be, in this instance the crowns, are made and placed in position, an impression is taken. A model is then made with the abutments in position, and placed on an articulator, a space being left for the proper amount of gold or other material to cover the occlusal surface of the tooth 4C, the wax is then carved for the articulation, and the wire or spur is attached to the wax. The whole is then removed, with or without the abutments, the tooth is then detached, and the waX is invested and cast.

If preferred, the tooth may remain atf tached to the wax and be invested and cast, but it is preferable to detach it while casting in order to obviate the danger of checking or cracking, or of changing its color, which might result if it were subjected to the heat of the fire used in casting.

The gist of the present invention resides in providing the occlusal surface of the tooth with a seat or depression 5 that is designed to receive a teat 6 that is formed on the bridge in casting, and by this method backings and anchor plates that are difficult to fit in a tooth are dispensed with. Generally, a single seat will be all that is necessary, but as shown in Fig. t a plurality of seats may be employed when the tooth is of large size and eXtra strength is desired.

The teat 6 is of truncated cone shape, the seat 5 being of a shape snugly to tit the teat. The object of thus constructing the parts is to secure the maximum strength with the greatest ease in liting and minimum resistance to separation of the tooth from the bridge, thus dispensing with a dove-tailed connection between the parts that is objectionable when repairs are necessary.

It will be seen that to carry out the present invention it will only be necessary, generally, to provide a seat in the grinding or occlusal surface of the tooth and only a single cusp or grinding surface for each tooth and as pointed out these cusps can be formed and joined in casting wax and cast in one piece. It may be cast on the crowns at the saine time, that is the whole bridge can be cast at one operation, requiring no longer time to cast a bridge or several teeth than only one or two. The tooth may be repaired without removing the bridge from the mouth, and requires no soldering, and

-further only one grade of gold is required which may be of comparatively low grade, thus effecting a pronounced saving in the cost of the operation. Further the tooth is stronger as it contains more porcelain and bears a close resemblance to the natural tooth both in size and form. By having the anchor or teat positioned in the larger portion of the tooth tends to make the connection stronger, there being no frail edges to contendy with as with ordinary crown and face provided With an anchoring seat of bridge Work. The tooth can be ground on truncated cone shape, and a bridge having al1 sides or into any shape adapting it for an integral anchor cast into the seat and cases requiring a narrovv tooth or a short corresponding in contour thereto.

5 bite.V Y' In testimony that I claim the foregoing The tooth Will `retain its natural color as my own, I have hereto aixed my signabtter ltcllian the rdinary articlef'of tooth as ture in the presence of two Witnesses. t ego 'is on t e grindinosur ace onl a T feature that will be appreciated by pergons LOXD DAVIS' 10 Who Wear teeth of this character. Witnesses:

What is claimed is WESLEY SCHNEIDER, An artificial tooth having its occlusal sur- A. J. BEGER.

Copiesrof this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

i Washington, D. C. 

